package com.jxxhwl.wx.service.impl;

import java.security.MessageDigest;
import java.util.Arrays;

import org.springframework.stereotype.Service;

import com.jxxhwl.wx.entity.WXObject;
import com.jxxhwl.wx.service.WXObjectService;
@Service
public class WXObjectServiceImpl implements WXObjectService{
	
	/**
	 * ΢�Žӿڽ���
	 */
	@Override
	public boolean check(WXObject wXObject) {
		String[] str = new String[]{wXObject.getToken(),wXObject.getTimestamp(),wXObject.getNonce()};
		Arrays.sort(str);
		String content = "";
		for(int i = 0;i<str.length;i++){
			content += str[i];
		}
		String  tmp = getSha1(content);
		return tmp.equalsIgnoreCase(wXObject.getSignature());
	}
	
	/**
	 * Sha1
	 * @param str
	 * @return
	 */
	public static String getSha1(String str) {
		if (str == null || str.length() == 0) {
			return null;
		}
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };

		try {
			MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
			mdTemp.update(str.getBytes("UTF-8"));

			byte[] md = mdTemp.digest();
			int j = md.length;
			char buf[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
				buf[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(buf);
		} catch (Exception e) {
			return null;
		}
	}
}
